Dhéritabilité

Dhéritabilité is a term used in genetics and statistics to describe the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals. It is a measure of how much of the observable differences between individuals in a trait can be explained by the differences in their genes. It is important to note that dhéritabilité does not refer to the proportion of a trait that is "inherited," as traits are always a result of the interaction between genes and environment.

Dhéritabilité is typically expressed as a value between 0 and 1. A dhéritabilité of 0 means that none of the variation in the trait is due to genetic differences. A dhéritabilité of 1 means that all of the variation in the trait is due to genetic differences. For example, if a trait has a dhéritabilité of 0.6, it means that 60% of the observed variation in that trait within a population can be attributed to genetic factors. The remaining 40% would be due to environmental factors and their interaction with genes.

Dhéritabilité is a population-specific measure. This means that the dhéritabilité of a trait can vary from one population to another. For instance, the dhéritabilité of height might be different in a population with access to good nutrition compared to a population facing malnutrition. It is also important to understand that dhéritabilité is not fixed; it can change if the genetic makeup or the environmental conditions of the population change. It is a useful concept for understanding the sources of variation in traits and can inform research in fields such as agriculture, animal breeding, and human behavioral genetics.